Process for preparing narasin

Abstract

The new microorganism Streptomyces granuloruber, NRRL 12389 and the fermentation process for preparing narasin by submerged aerobic fermentation of this organism.

I claim: 
     
       1. The method of producing the antibiotic narasin which comprises cultivating Streptomyces granuloruber, NRRL 12389, or a narasin-producing mutant or variant thereof, in a culture medium containing assimilable sources of carbohydrate, nitrogen, and inorganic salts under submerged aerobic fermentation conditions until a substantial amount of antibiotic activity is produced by said organism in said culture medium. 
     
     
       2. The method of claim 1 wherein the organism is Streptomyces granuloruber, NRRL 12389. 
     
     
       3. The method of claims 1 or 2 which includes the additional step of separating narasin from the culture medium. 
     
     
       4. A biologically pure culture of the microorganism Streptomyces granuloruber, NRRL 12389.